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【单选题】
若张某消费牛奶和面包时的边际替代率为1/4，即一单位牛奶相当于1/4单位的面包，则A.
牛奶价格为4，面包价格为1时，张某获得最大效用
B.
牛奶价格为1，面包价格为4时，张某获得最大效用
C.
牛奶价格为10，面包价格为2时，张某应增加牛奶的消费
D.
以上都不对
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举一反三
【单选题】I wish I ______ in Hawaii longer last week, but I had to come back and go to work.
A.
had stayed
B.
might have stayed
C.
stayed
D.
have stayed
【单选题】I wish I ______part in the concert, but I had to prepare for the examination.
A.
have taken
B.
took
C.
might have taken
D.
could have taken
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